run shell_command list like expect script

[zhangnew]

I use tmux 2.3, tmuxp 1.3.5, Python 3.6.4, when I use this config:

    panes:
      - shell_command:
          - ssh root@x.x.x.x
          - pwd

when ssh command slow, these two command run together, not run pwd in machine x.x.x.x

if run in expect , such as expect "*#" { send "pwd\r" } means when run ssh root@x.x.x.x done and show command prompt *#, then run pwd.

instead of run commands like this

tmuxp/tmuxp/workspacebuilder.py

Lines 335 to 336 in 18f7492

	for cmd in pconf['shell_command']:
	p.send_keys(cmd, suppress_history=suppress)

Another way is that write a shell_command to run a expect script.